my overclocked amd wont reset.

an overclocking utility which came along with MB used to show my system as 1800MHZ as 200 MHZ with a multiplier of 9. some tweaking made it 201Mhz and x 9 and hence my system ran to 1809 MHz. but now even after i have reset the overclock and system shows 200x9 yet the running sped of the machine is 1809 Mhz and somehow i feel the macine is very laggy, ie Windows media player /winamp takes a few secs to open up etc. . . n so on.